Inventories - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2016
Inventory, Net [Abstract]
Other than LIFO inventory	$ 126.1		$ 126.1		$ 118.4
Cost of sales - excess inventory write-down	$ 0.0	$ 22.5	$ 0.0	$ 22.5